Extrusion-machine.



c. F. BuIIIIouGIIs I F. B. NoIIIIIIIuP.

EXTHUSION MACHINE. APPLICATION FILED IIIIY20. I9I4. j

Patented Nov. 30, 1915.

3 SHEETS-SHEET l.

c. F. BuRnouGHs L F. B. NoRTHIIuP.

EXTHUSION MACHINE.'

APPLICATION FILED MAYZO, |914.

151623535. .Patented Nov. 3o, 1915.

V. 3 SHEETS-SHEET 2- C. F. BURROUGHS & F. B. NOHTHRUP.l

ExTRusloN MACHINE. APPLICATION FILED yMAY 20. |914. 1,162,335.

3 SHEETS-SHEET 3.

\ anted Nov. 30, 1915.

UisuraD s'rA'rEs- PATENT oFFIoE.

CHARLES F. BURROUGHS, OF EAST OR-AANGE,

ANnFnANcrs B. Non'rHnUP, or QRANGE,

NEWJERSEY, ASSIGNORS T0 THE CHARLES BURROUGHS COMPANY, OF NEWARK, NEW JERSEY, A CORPORATION OF NEW JERSEY.

EXTRUSION- MACHINE.

Specification of Letters Patent.

Patented Nov. 3o, .1915.

Application led May 20, 1914. Serial No. 839,685.

. RoUGHs, residing at 122 Prospect street, East Orange, county of Essex, and State of New Jersey, and FRANCIS B. NORTHRUP, residing at 106 Day street, Orange, county of Essex, and State of New Jersey, both citizens of the United States, have invented certain new and usefullmprovements in Extrusion-Machines, fully described and represented in the following specification and the accompanying drawings, forming a part of the saine.

The present invention relates to a press vfor extruding plastic-material through a die of any given cross section, so as to form a continuous bar of material having such section. Such extrusion presses are often called stuiing machines, and such presses usually have a hydraulic cylinder at one end and a stuiing-cylinder at the other end connected with the hydraulic-cylinder by round detachable tie-bars. It is essential that the plunger on the ram should enter the stuffingcylinder centrally so as to avoid injury to the sides of the same, and great difficulty Vhas been found in making the two cylinders concentric where the heads of the frame or the cylinder bodies are connected by separate tie-bars.

The present invention is designed to over- A come such diiliculty, and effects this objectby making the frame in one piece of castmetal, with side tension-bars, and integral end-rings bored out with concentric bores to receive the two cylinders. v

The cylinders have turned waists to lit the bores, and shoulders or flanges adapted to t seats upon the inner sides of the rings about such bores, and the longitudinal strain is transmitted bythe shoulders to the rings and sustainedby the opposite side-bars.

Such strain is very severe, but is readily supported by making the side-bars of adequate cross section, which, in the case of cast-steel, needsto be little, if any, larger than the cross section of ordinary tie-rods.

The cylinders .are held more rigidly and accurately in line with one another, by forming the flanges which support themv upon the rings as near as vpossible to the end of the cylinder, but in the' case of a stuffingcylinder when a heating-jacket is required about the same, it is preferable that the cylinder should project inside and outside of its supporting ring so that the jackets can be applied to the cylinder at ring, thus heating the jacket at both ends, rnd t1ubstantially" throughout its entire eng The use of flat side-bars disposed exactly both sides of such opposite the center line of ,the press furnishes a convenient support for longitudinal guides supplied upon the edges of such side-barato support a .crosshead upon the ram and guide the same in moving the plunger into the stuffing-cylinder.

The ram is preferably formed with a piston-head upon one end which receives the pressure to operate the plunger, and the cylinder is provided upon its inner end with a stuiing-box to prevent, as far as possible,

leakage around the body of the ram, when Water is introduced between such stuffing-- box and the head of the ram to retract the plunger from the stufling-cylinder.

Where the'press has a vertical axis, the

A.hydraulic cylinder is placed at the top and the crosshead vis preferably formed as a water-pan forming a tightjoint with the ram and serving to catch any water which escapes from-the stuffing-box.

A special construction is provided for indicating the temperature of the metall of the stuling-cylinder.

The invention will be understoodby'reference to the annexed drawing, in which- Figure 1 is 'an edge `View of a press embodying the improvements; Fig. 2 is a side view of the same; Fig. 3 is a vertical section of the s tuiiing-cylinder and. adjacent parts; Flg. L ls a section on line 4- 4 in Fig. 2; and Flg. 5 is a Vertical section of the hy-v draulic cylinder' and adjacent parts.

The frame of the press has two cylinder supportingrings a and b integral with Hat tension-bars c which are disposed at' opposite sides of the centers' of the rings. To lighten such bars, they are formed with perforatlons c; The rings have bores a and b '60, jacket and screwed into the boss,and a nut to center the cylinders therein, and an annular seat al or d upon the inner side of the ring. around such bore. The hydrauliccylinder e has an annular band or waist' f turned cylindrical to snugly fit the bore a in the ring a, and a flange g fitted to the seat d upon such ring.

The cylinder projects outwardly beyond the head and has a cap or ring h secured -upon its outer end, and a stuling-box i secured upon its inner end. The ram j is a little smaller than the bore e andhas a head 7c upon its inner end provided with suitable packing and follower. The ram is fitted to the stuiiing-box z" and its outer end is reduced in diameter to form a suitable plunger Z, to enter the stulting-cylinder. A crosshead m of pan-shape is attached to the lower end of the ram at its junction with the plunger, and the four corners of such crosshead are formed with rectangular notches m', asf shown in Fig. 4, to lit rectangular ribs n, which are attached to the edges of the side-bars c by feet n and bolts n2. The stufiing-cylinder o has a circular flange 7? fitted to the seat d upon the ring b, and a waisty g fitted snugly to the bore b in such y head.- The cylinder projects inwardly from the Hangep sufficiently to apply a jacket r, and the cylinder also projects outwardly from the fla-nge beyond the ring b, and a jacket r is applied to such projecting portion.4 The jackets are held from the surface yof the cylinder a suitable distance by collars s, to form space for the steam and are secured steam-tight to the cylinders in any suitable manner.

A die-holder t is shown attached to the outer end of the stuffing-cylinder to close the 'same and carry the extrusion die u, which may have a bore of any desirable shape or section. A

Heretofore it has been common to insert a thermometer bulb into the steam-space of the heating-jacket r, or r to secure the temperature of such space; but this does not indicate accurately the temperature of the cylinder-body o, and special made herein for bringing the thermometerbulb into contact with the m tal of such cylinder close to its bore. This i effected by projecting a boss w.from the iside of the cylinder o into line with the interior of the jacket, so that when the .jacket is applied to the cylinder it may touch such bss. A hole fw is formed through the jacket and the boss, and extended into the body of the cylinder nearly to its bore.

A threaded tube is extended through the is applied to the tube outside of the jacket to press the same toward the boss to make a steam-tight joint therewith, a suitable packing being inserted between the boss and jacket for such purpose.

vprox-'isi on is The dial-type of thermometer is made with a metallic bulb and body y which may be inserted through the tube and hole w into contact with the metal of the cylinder o, and the outer end of the body ,1/ is connected by a suitable conductor passing through a sheath y to the dial, where the temperature is indicated.

In the manufacture ofthe press, the integral frame comprising the tension-bars c and the heads a and b is mounted in a boring machine, and the bores a and b with the seats Z and d surrounding the same are all formed in one operation, so as to make the bores absolutely concentric and the seats absolutely at right-angles with the axis of the frame. have their waists and ianges turned at the same timevthat their interior is bored, so that when they are fitted to the bores and seats, the two cylinders may'accurately aline with one another, and the plunger upon one be exactly concentric with the bore of the other. With this construction, the necessity for great care and skill is avoided, which is required to make the cylinders of a stuiing press concentric with one another' if tied together by detachable tension-rods.

The length of the space between the heads is made sufficient to introduce either of the cylinders laterally between the sidebars c and then push the body of the cylinder lengthwise into the required bore until the ange of such cylinder fits the seat thereon which then sustains all 'of the end-thrust developed in the operation of the press. The end-thrust is therefore not sustained by nuts, keys or loose fastenings, but is supported directly upon the inner sides of heads, which are integral with one another and with the side-bars 0. With such construction, the strain is sustained entirely by the contact of the cylinder flanges with the inner sides of the heads, and no strain whatever .is

sustained by the bolts or nuts g which fasten the cylinders to their seats so as to merely hold them in place.

The integral frame is adapted to support the cylinders in either a horizontal or vertical position, as may be desired, and means for supporting the press in an upright posi- The cylinders, in like manner,

tion is shown in Figs. 1 and 2 in the -triangular frame having legs a, which are fitted to seatsz upon the outer sides of the side-bars and one ofthe heads and secured thereto by bolts z2. If the press were to be used ina horizontal position, a suitable leg would be bolted to the frame under each end.

It will be vobserved that, in Figs. 2 and 4, the heads a and b have wings a? and b2 at opposite sides of their center, from the ends of which the side-bars c project to unite the heads integrally. The provision of such wings greatly increases the space between the side-bars, and facilitates the access of the operator to the bore of thefstuiing-cylin- I-Iaving thus set forth the nature of the invention what is claimed herein is:

1. In an extrusion machine, the combination, with a cast-metal frame having sidebars with integral rings at their opposite ends having concentric bores therein and seats upon the inner sides of the rings about such bores, of a hydraulic cylinder and a stuffing-cylinder fitted respectively and removably to the said bores and having each a flange fitted to the annular seat about such bore, said flanges thus transmitting the longitudinal strain to the inner sides of the two rings.

2. In an extrusion machine, the combination, with a cast-metal frame having sidebars with integral rings at their opposite ends having concentric bores therein, and seats upon the inner sides of the rings about such bores, of a hydraulic cylinder having a waist fitted removably to the bore of one ring and a shoulder fitted to the seat thereon and having a ram to press the extruding material, and a stufling-cylinder having a 'aist fitted removably to the bore of the other ring and having a shoulder fitted to the seat thereon and a chamber to receive the plunger on said ram, Wherebyhthe cylinders are accurately centered, and the strain produced by the ram is imposed upon the inner sides of both bars.

3. In an extrusion machine, the combination, with a cast-metal frame having. sidebars with integral rings at their opposite ends having concentric bores therein and rings and the integral side-- seats upon the inner sides of the rings about such bores, of a hydraulic cylinder having a waist fitted removably to the bore of one ring and a shoulder` fitted to the seat thereon and having a ram to press the extruding material, and a stuffing-cylinder having a Waist fitted removably to the bore of the other ring and having a shoulder fitted to the seat thereon and a chamber to receive the plunger on said ram, the said stuiing-cylinder projecting inwardly and outwardly from the said ring and having separate heating jackets applied to such projecting portion, whereby the whole cylinder is heated as desired.

4. In an extrusion machine, the combination, with a cast-metal frame having tensionbars at opposite sides, and integral heads at opposite ends with concentric bores therein, of a hydraulic cylinder and a stuffingcylinder centered respectively in the bores of such heads and supported against endthrust thereon, the hydraulic cylinder having a ram, and the stuffing-cylinder having a stuffing-chamber to receive such ram', the side-bars having seats upon their edges with longitudinal guides attached thereto and a Water-pan fitted tightly to the ram and having notches in the corners fitted to the said guides.

In testimony whereof we have hereunto set our hands in the presence of tWo sub` scribing witnesses.

Witnesses:

JOEL SUNDsTRoM, F. L. MoRToN. 

